Power-hammer.



R. E. BATES.

POWER HAMMER.

APPLIOATION FILED APR. so, 1913.

Patented Jan; 20, 1914.

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R. E. BATES.

POWER HAMMER.

APPLICATION IILIBD APR. 30, '1913.

Patented Jan. 20, 1914.

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R. E. BATES.

POWER HAMMER.

APPLICATION FILED APR. so, 1913.

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UNITED STATES PATENT oFFroE.

RALPH E. BATES, OF PHILADELPHIA, PENNSYLVANIA, ASSIG-NOR TO JOHN NAZEL, OF

' PHILADELPHIA, PENNSYLVANIA.

POWER-HAMMER.

Specification of Letters Patent.

Application filed April so, 1913. Serial No. 764,529.

To all whom. it may concern Be it known that I, RALPH E. BATES, a citizen of the United States, residing in the city of Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented certain Improvements in Power- Hammers, of which the following is a specification.

This invention is a power hammer of improved design, characterized by simplicity, compactness and strength.

It comprises few parts, which can be readily assembled and dissociated so that access may be conveniently had and repairs made without diiiiculty.

In the preferred form, the I stationary power cylinder and the power piston movable therein are disposed substantially in alinement wit-h the stationary ram piston and the cylindrical ram movable thereon; the ram being guided throughout its entire stroke by standards supporting the pistons and cylinder cotiperating therewith. The valve mechanism, of compact construction located between the power cylinder and ram piston, permits the operation of the power piston while the ram is stationary.

The features characterizing my invent-ion 'are more fully set out in the following specification and the accompanying drawings in illustration thereof.

In the drawings, Figure 1 is a front elevation of a hammer embodying my improvements; Fig. 2 is a side elevation of the same; Fig. 3 is a sectional view on the line A-A of Fig. 1 witlr the valve mechanism in the position for operating the ram; Fig. 4 is a sectional view representing a second position of mechanism shown in Fig. 3; Fig. 5 is a perspective view of the detached ram; Fig. 6 shows a section of the power cylinder having relief ports therein; Fig. 7 shows a further section of the power cylinder con.- taining relief ports; Fig. 8 is a transverse sectional view of the valve mechanism taken .on the line B-B of Fig. 3; Fig. 9 is a the power cylinder communicates wit-h the ram cylinder;'and Fig. 12 is a perspective view of a valve casing through whlch at- As shown in the drawings, the hammer comprises the base 1 having thereon the anvil block 2 and the standards 3 fixed on opposite sides of the block by bolts 4 and set screws 5, the latter permitting a limited lateral adjustment of the standards. A cylinder 6 is provided with the head 7 and bearings or standards 8 which are fixed on the standards 3 by bolts 9.. A piston 10 is movable in the cylinder 6 by the pitman 11 connected therewith and with the crank shaft 12, which latter is journaled in the bearings 13 fixed on the standards 8 by bolts 14, the shaft being driven by the pulley 15.

The head 7 has a hollow piston 16 fixed thereto on which is movable the cylindrical ram 17 having the block 18 which cooperates with the block 2 of the anvil and the guides 19 movable in the ways 20 of the standards 3. The head 7 contains the cylindrical valve seat 21 which communicates by the passage 22 with the interior of the cylinder 6, by the passage 23 through the piston 16 with the interior of the cylinder 17,

by the passage 24 under control of the valve 25 with the passage 26 to the atmosphere,

22 with the passage 23 in the position of the valve illustrated in Fig. 3 and for connecting the passage-22 with the passages 24, 27, and 30in the position of the valve illustrated in Fig. 4, the valve being rocked by an arm 35 thereon, a link 36 connected with the arm, a treadle 37 connected with the link, and a spring 38 connecting the base and the treadle so as to elevate the latter.

The cylinder 6 is provided with the ports 39 through which it communicates with the atmosphere in the upper position of the piston 10, and with the ports 40 and 41 communicating through the chamber 42, the cylinder 6 communicating with the atmosphere in the lower position of the piston, when the ports 43 thereof are in registration with the ports 41, through the ports 40, chamber 42,

60 municating with said first named cylinder,

ports 41 and ports 43, to relieve the pressure in front of the piston.

A valve 44 within the head of the ram 17 enters the passage 23 through the piston 16 to trap the air in the ram cylinder and cushion the rise of the ram, the by-pass 45 and the valve 46 in the piston 16 connecting the passage 23 with the ram cylinder providing means for communicating pressure to the cylinder 17 when the valve 44 is inserted in the-passage 23.

- It will now be understood that when the shaft 12 is revolved by the pulley '15, the pitman 11 is caused to reciprocate the power piston 10 in its cylinder 6. When the valve 33 is in the position illustrateo in Fig. 3, the rise of the piston 10 exhausts air from the interior of the ram 17, through the passages 23, 34 and 22 until the relief ports 39 are uncovered, whereupon atmospheric air enters the cylinder 6 and is compressed in the downward movement of the piston 10 to. drive down the ram 17. When the valve 33 is in the position shown in Fig. 4, the rise of the piston 10 opens the valves 25 and 31, exhausts the cylinder 17 through the passages 23, 32 and 30, and takes air from the atmosphere through the passage 26, the valve 25 being set to open at a higher pressure than the valve 31. When in this position of the valve 33 shown in Fig. 4, the piston l0 descends, air is forced from the cylinder 6 through the passage 27 to the atmosphere, the check valve 28 being opened and the check valve 31 (as also the check valve 25) being closed by this action, so that the ram remains in the elevated position.

Having described my invention, I claim:

1. A power hammer comprising a stationary cylinder, a power piston movable in said cylinder, a stationary piston depending from said stationary cylinder, a hollow ram movable along said stationary piston, and means whereby the reciprocation of said movable piston in said cylinder reciprocates said ram relatively to said stationary iston.

2. A power hammer comprising a stationary cylinder, a power piston movable'in said cylinder, a stationary piston disposed substantially in alinement with said power piston and having a passage therethrough communicating with said cylinder, and a hollow ram movable on said stationary piston and communicating with said passage.

3. A power hammer having a stationary cylinder having a head, a power piston in said cylinder, a stationary piston depending from said head substantially in alinement with said power piston, said stationary piston having therein a passage coma hollow; ram sleeved on said piston having its interior in communication with said passage, and valve mechanism controlling the communication of said cylinder with said passage. v 4. A power hammer comprising a base, a pair of standards having parallel ways, a hollowram having guides disposed in said Ways, a cylinder carried .by said standards above said ram, a stationary piston supported by said standards below said cylinder and on which said ram reciprocates, and means comprising a piston in said cylinder for reciprocating said ram.

5. A power hammer comprising a cylinder, a power piston therein, a stationary piston having a passage therein, a ram sleeved on said stationary piston, a valve seat forming a chamber communicating with said cylinder and passage, means comprising a plurality of ports communicating with the chamber of said seat, a valve movable in said seat and adapted to establish communications between said cylinder and passage or between said cylinder and said ports alternately, and valve mechanism for controlling said last named ports whereby said ram is held stationary while said power piston reciprocates- 6. A power hammer comprising a cylinv der, a power piston therein, a stationary piston containing a passage, a ram reciprocating on said stationary piston, a valve seat forming a chamber communicatin with said cylinder and passage, a valve a apted for closing said passage,means having therein passages connecting said chamber with the atmosphere, oppositely acting valves for con trolling said last named passages, and valve mechanism for permitting communication between said cylinder and passage first named when it is closed by said valve.

7 A power hammer comprising a stationary cylinder, a power piston movable therein, a stationary piston having a passage therethrough, a hollow ram on said stationary piston, a valve seat forming a chamber communicating with said cylinder and passage, means having therein'passag'es connecting said chamber with the atmosphere, oppositely acting check valves for controlling said last named passages, a valve carried by said seat whereby said cylinder is connected alternately with said first and second named passages, and meanscomprising a passage controlling said last named passages, means having therein an exhaust passage connecting said valve seat with said first named passage, a check valve controlling said exhaust passage, and a valve in said seat controlling communication between said cylinder and passages.

9. A power hammer comprising a base, standards fixed thereto, a cylinder having a head carried by said standards, a piston movable in said cylinder, a piston depending from said head below said cylinder, a cylinder movable on said fixed piston, and means comprising passages and valves in said head whereby said first named piston reciprocates said second named cylinder.

10. A power hammer comprising a base, standards fixed thereto, a head fixed to said standards, a cylinder and piston fixed to said head, a power iston in said cylinder, a hollow ram on sald fixed piston, means having therein a passage connecting said cylinder and ram, and valve mechanism controlling said passage. 7

11. A power hammer comprising a hollow cylinder, a piston therein, a second hollow cylinder, means having therein a passage through which said cylinders communicate,

means having therein a pass through which said cylinders communicate, a check valve controlling said pass, means having therein passes through which said piston cylinder communicates with the atmosphere, oppositely acting check valves controlling the respective passes last named, and a valve controlling said passage and passes.

In testimony whereof I have hereunto set my name this 16th day of April, 1913, in

thepresence of the subscribing witnesses.

RALPH E. BATES.

Witnesses:

Joe. G. DENNY, Jr., Gno. A. CUNNEY. 

